Revert "drivers: pinmux: build as static library"

This reverts commit 4330929.

Fixes: zephyrproject-rtos#38403

The referred commit introduced `zephyr_library()` for pinmux drivers but
also resulting in zephyrproject-rtos#38403 because several boards has `CONFIG_PINMUX=y`
without selecting any pinmux drivers from `drivers/pinmux` thus
generating the following warning:
> No SOURCES given to Zephyr library: drivers__pinmux
>
> Excluding target from build.

This commit reverts the changes so that this warning disappears.
This results in pinmux drivers from `drivers/pinmux` to be located in
libzephyr.a which is messy, but has been so for a long time, even before
Zephyr 1.14 LTS.

The future pinctrl API will be designed in such a way that this problem
will not occur. Thus the old behavior is acceptable until the transition
to pinctrl API has completed.

Signed-off-by: Torsten Rasmussen <[email protected]>

drivers/pinmux/CMakeLists.txt

@@ -1,19 +1,17 @@
 # SPDX-License-Identifier: Apache-2.0
 
-zephyr_library()
-
 # Board initialization
-zephyr_library_sources_ifdef(CONFIG_PINMUX_CC13XX_CC26XX   pinmux_cc13xx_cc26xx.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_ESP32           pinmux_esp32.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_HSDK            pinmux_hsdk.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_INTEL_S1000     pinmux_intel_s1000.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_ITE_IT8XXX2     pinmux_ite_it8xxx2.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_LPC11U6X        pinmux_lpc11u6x.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_MCUX            pinmux_mcux.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_MCUX_LPC        pinmux_mcux_lpc.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_RV32M1          pinmux_rv32m1.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_SAM0            pinmux_sam0.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_SIFIVE          pinmux_sifive.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_STM32           pinmux_stm32.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_TELINK_B91      pinmux_b91.c)
-zephyr_library_sources_ifdef(CONFIG_PINMUX_XEC             pinmux_mchp_xec.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_TELINK_B91      pinmux_b91.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_CC13XX_CC26XX   pinmux_cc13xx_cc26xx.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_ESP32           pinmux_esp32.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_HSDK            pinmux_hsdk.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_INTEL_S1000     pinmux_intel_s1000.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_ITE_IT8XXX2     pinmux_ite_it8xxx2.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_LPC11U6X        pinmux_lpc11u6x.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_MCUX            pinmux_mcux.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_MCUX_LPC        pinmux_mcux_lpc.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_RV32M1          pinmux_rv32m1.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_SAM0            pinmux_sam0.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_SIFIVE          pinmux_sifive.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_STM32           pinmux_stm32.c)
+zephyr_sources_ifdef(CONFIG_PINMUX_XEC             pinmux_mchp_xec.c)