stm32: flash: pull out i/d cache support.

Copied a few times.

lib/stm32/l4/Makefile

@@ -47,7 +47,7 @@ OBJS            += exti_common_all.o
 OBJS            += adc_common_v2.o adc_common_v2_multi.o
 OBJS            += crc_common_all.o crc_v2.o
 OBJS            += crs_common_all.o
-OBJS            += flash_common_all.o flash_common_f.o
+OBJS            += flash_common_all.o flash_common_f.o flash_common_idcache.o
 OBJS            += rng_common_v1.o
 OBJS            += timer_common_all.o
 OBJS            += i2c_common_v2.o

lib/stm32/l4/flash.c

@@ -58,51 +58,6 @@ void flash_wait_for_last_operation(void)
 	while ((FLASH_SR & FLASH_SR_BSY) == FLASH_SR_BSY);
 }
 
-/** @brief Enable the Data Cache
- */
-void flash_dcache_enable(void)
-{
-	FLASH_ACR |= FLASH_ACR_DCEN;
-}
-
-/** @brief Disable the Data Cache
- */
-void flash_dcache_disable(void)
-{
-	FLASH_ACR &= ~FLASH_ACR_DCEN;
-}
-
-/** @brief Enable the Instruction Cache
- */
-void flash_icache_enable(void)
-{
-	FLASH_ACR |= FLASH_ACR_ICEN;
-}
-
-/** @brief Disable the Instruction Cache
- */
-void flash_icache_disable(void)
-{
-	FLASH_ACR &= ~FLASH_ACR_ICEN;
-}
-
-
-/** @brief Reset the Data Cache
- * The data cache must be disabled for this to have effect.
- */
-void flash_dcache_reset(void)
-{
-	FLASH_ACR |= FLASH_ACR_DCRST;
-}
-
-/** @brief Reset the Instruction Cache
- * The instruction cache must be disabled for this to have effect.
- */
-void flash_icache_reset(void)
-{
-	FLASH_ACR |= FLASH_ACR_ICRST;
-}
-
 /** @brief Clear the Programming Sequence Error Flag
  * This flag is set when incorrect programming configuration has been made.
  */