Cleaning out workaround patches for G431KB now that Flash Bank Switching has been fixed on G4xxx level (ARMmbed/mbed-os patch #14149)

Author: Tauno Magnusson

targets/TARGET_STM/TARGET_STM32G4/STM32Cube_FW/CMSIS/stm32g431xx.h

@@ -9604,10 +9604,9 @@ typedef struct
 #define SYSCFG_MEMRMP_MEM_MODE_1        (0x2UL << SYSCFG_MEMRMP_MEM_MODE_Pos)  /*!< 0x00000002 */
 #define SYSCFG_MEMRMP_MEM_MODE_2        (0x4UL << SYSCFG_MEMRMP_MEM_MODE_Pos)  /*!< 0x00000004 */
 
-// Commented out because G431KB only has one Flash Bank
-// #define SYSCFG_MEMRMP_FB_MODE_Pos       (8U)
-// #define SYSCFG_MEMRMP_FB_MODE_Msk       (0x1UL << SYSCFG_MEMRMP_FB_MODE_Pos)   /*!< 0x00000100 */
-// #define SYSCFG_MEMRMP_FB_MODE           SYSCFG_MEMRMP_FB_MODE_Msk              /*!< User Flash Bank mode selection */
+#define SYSCFG_MEMRMP_FB_MODE_Pos       (8U)
+#define SYSCFG_MEMRMP_FB_MODE_Msk       (0x1UL << SYSCFG_MEMRMP_FB_MODE_Pos)   /*!< 0x00000100 */
+#define SYSCFG_MEMRMP_FB_MODE           SYSCFG_MEMRMP_FB_MODE_Msk              /*!< User Flash Bank mode selection */
 
 /******************  Bit definition for SYSCFG_CFGR1 register ******************/
 #define SYSCFG_CFGR1_BOOSTEN_Pos        (8U)

targets/TARGET_STM/TARGET_STM32G4/STM32Cube_FW/STM32G4xx_HAL_Driver/stm32g4xx_hal.c

@@ -595,9 +595,7 @@ void HAL_SYSCFG_CCMSRAMErase(void)
   */
 void HAL_SYSCFG_EnableMemorySwappingBank(void)
 {
-  #if defined(SYSCFG_MEMRMP_FB_MODE)
   SET_BIT(SYSCFG->MEMRMP, SYSCFG_MEMRMP_FB_MODE);
-  #endif
 }
 
 /**
@@ -612,9 +610,7 @@ void HAL_SYSCFG_EnableMemorySwappingBank(void)
   */
 void HAL_SYSCFG_DisableMemorySwappingBank(void)
 {
-  #if defined(SYSCFG_MEMRMP_FB_MODE)
   CLEAR_BIT(SYSCFG->MEMRMP, SYSCFG_MEMRMP_FB_MODE);
-  #endif
 }
 
 #if defined(VREFBUF)