Remove matrix_col_t to allow MATRIX_ROWS > 32 (qmk#10183)

The matrix_col_t type was added in commit 0284431 (part of qmk#3449),
but then the code which used that type was removed in qmk#6140, and no
other users were added since that time.  The presence of that type,
however, limits MATRIX_ROWS to 32, which probably does not matter for a
real keyboard, but prevents doing things like making a firmware to test
all existing pins on a board like Teensy++ 2.0 (which has 46 GPIOs).

tmk_core/common/matrix.h

@@ -0,0 +1,80 @@
+/*
+Copyright 2011 Jun Wako <[email protected]>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef MATRIX_H
+#define MATRIX_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#if (MATRIX_COLS <= 8)
+typedef uint8_t matrix_row_t;
+#elif (MATRIX_COLS <= 16)
+typedef uint16_t matrix_row_t;
+#elif (MATRIX_COLS <= 32)
+typedef uint32_t matrix_row_t;
+#else
+#    error "MATRIX_COLS: invalid value"
+#endif
+
+#define MATRIX_ROW_SHIFTER ((matrix_row_t)1)
+
+#define MATRIX_IS_ON(row, col) (matrix_get_row(row) && (1 << col))
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* number of matrix rows */
+uint8_t matrix_rows(void);
+/* number of matrix columns */
+uint8_t matrix_cols(void);
+/* should be called at early stage of startup before matrix_init.(optional) */
+void matrix_setup(void);
+/* intialize matrix for scaning. */
+void matrix_init(void);
+/* scan all key states on matrix */
+uint8_t matrix_scan(void);
+/* whether modified from previous scan. used after matrix_scan. */
+bool matrix_is_modified(void) __attribute__((deprecated));
+/* whether a switch is on */
+bool matrix_is_on(uint8_t row, uint8_t col);
+/* matrix state on row */
+matrix_row_t matrix_get_row(uint8_t row);
+/* print matrix for debug */
+void matrix_print(void);
+/* delay between changing matrix pin state and reading values */
+void matrix_io_delay(void);
+
+/* power control */
+void matrix_power_up(void);
+void matrix_power_down(void);
+
+/* executes code for Quantum */
+void matrix_init_quantum(void);
+void matrix_scan_quantum(void);
+
+void matrix_init_kb(void);
+void matrix_scan_kb(void);
+
+void matrix_init_user(void);
+void matrix_scan_user(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif