Bugfix for EFM32PG12 and EFR32MG12

* Off by one error in the linker scripts reserved one word too little for the vector table
* Re-apply uvisor changes to emlib. To allow uvisor to run, we should make accesses to the romtable through uvisor's secure read gateway
* Copypasta in target name (EFM32PG12, not EFR32PG12)
* Copypasta in the pin definitions (thanks @akselsm)
* Forgot to update PortName for extra ports on MG/PG12

Author: stevew817

targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFR32PG12/PeripheralNames.h renamed to targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32PG12/PeripheralNames.h

@@ -8,7 +8,7 @@ LR_IROM1 0x00000000 0x00100000  {    ; load region size_region
    *(InRoot$$Sections)
    .ANY (+RO)
   }
-  RW_IRAM1 0x20000108 0x0003FEF8  {  ; RW data
+  RW_IRAM1 0x2000010C 0x0003FEF4  {  ; RW data
    .ANY (+RW +ZI)
   }
 }

targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFR32PG12/PeripheralPins.c renamed to targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32PG12/PeripheralPins.c

@@ -17,8 +17,8 @@ MEMORY
 
 /* MBED: mbed needs to be able to dynamically set the interrupt vector table.
  * We make room for the table at the very beginning of RAM, i.e. at
- * 0x20000000. We need (16+50 * sizeof(uint32_t) = 264 bytes for EFM32PG */
-__vector_size = 0x108;
+ * 0x20000000. We need (16+51 * sizeof(uint32_t) = 268 bytes for EFM32PG */
+__vector_size = 0x10C;
 
 /* Linker script to place sections and symbol values. Should be used together
  * with other linker script that defines memory regions FLASH and RAM.

targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFR32PG12/PeripheralPins.h renamed to targets/TARGET_Silicon_Labs/TARGET_EFM32/TARGET_EFM32PG12/PeripheralPins.h

@@ -10,8 +10,8 @@ define symbol __ICFEDIT_intvec_start__ = 0x00000000;
 define symbol __ICFEDIT_region_ROM_start__   = 0x00000000;
 define symbol __ICFEDIT_region_ROM_end__     = (0x00000000+0x00100000-1);
 define symbol __NVIC_start__                 = 0x20000000;
-define symbol __NVIC_end__                   = 0x20000107;
-define symbol __ICFEDIT_region_RAM_start__   = 0x20000108;
+define symbol __NVIC_end__                   = 0x2000010B;
+define symbol __ICFEDIT_region_RAM_start__   = 0x2000010C;
 define symbol __ICFEDIT_region_RAM_end__     = (0x20000000+0x00040000-1);
 
 /*-Sizes-*/