Add support for STM32L0x.

First try to support new STM32L0x family. Tested
on NUCLEO-L053R8 development board
http://www.st.com/web/catalog/tools/FM116/SC959/SS1532/LN1847/PF260001

Chid ID, read, erase and write flash works fine.

flashloaders/stm32l0x.s

@@ -0,0 +1,66 @@
+/***************************************************************************
+ *   Copyright (C) 2010 by Spencer Oliver                                  *
+ *   [email protected]                                                  *
+ *                                                                         *
+ *   Copyright (C) 2011 Øyvind Harboe                                      *
+ *   [email protected]                                               *
+ *                                                                         *
+ *   Copyright (C) 2011 Clement Burin des Roziers                          *
+ *   [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, write to the                         *
+ *   Free Software Foundation, Inc.,                                       *
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
+ ***************************************************************************/
+
+
+// Build : arm-eabi-gcc -c stm32lx.S
+    .text
+    .syntax unified
+    .cpu cortex-m0plus
+    .thumb
+    .thumb_func
+    .global write
+
+/*
+    r0 - destination address
+    r1 - source address
+    r2 - count
+*/
+
+    // Set 0 to r3
+    movs    r3, #0
+    // Go to compare
+    b.n test_done
+
+write_word:
+    // Load one word from address in r0, increment by 4
+    ldr    r4, [r1]
+    // Store the word to address in r1, increment by 4
+    str    r4, [r0]
+    // Increment r3
+    adds    r3, #1
+	adds	r1, #4
+	// does not matter, only first addr is important
+	// next 15 bytes are in sequnce RM0367 page 66
+	adds	r0, #4
+
+test_done:
+    // Compare r3 and r2
+    cmp     r3, r2
+    // Loop if not zero
+    bcc.n    write_word
+
+    // Set breakpoint to exit
+    bkpt    #0x00