drivers/flash/Ambiq: Set erase capabilities, depending on SoC

The commit selects HAS_NO_EXPLICIT_ERASE for Apollo4,
with MRAM, and HAS_EXPLICIT_ERASE for Apollo3 which has Flash,
for a driver that shares code between SoCs.

In case of Apollo4 the no_explicit_erase capability is set to
true, while it remains false for Apollo3.

Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>

drivers/flash/Kconfig.ambiq

@@ -8,6 +8,8 @@ config FLASH_AMBIQ
 	select AMBIQ_HAL
 	select FLASH_HAS_PAGE_LAYOUT
 	select FLASH_HAS_DRIVER_ENABLED
+	select FLASH_HAS_NO_EXPLICIT_ERASE if SOC_SERIES_APOLLO4X
+	select FLASH_HAS_EXPLICIT_ERASE if SOC_SERIES_APOLLO3X
 	help
 	  Enables Ambiq flash driver on MRAM (e.g. Apollo4x) or
 	  flash (e.g. Apollo3x).

drivers/flash/flash_ambiq.c

@@ -48,6 +48,11 @@ static struct k_sem flash_ambiq_sem;
 static const struct flash_parameters flash_ambiq_parameters = {
 	.write_block_size = FLASH_WRITE_BLOCK_SIZE,
 	.erase_value = FLASH_ERASE_BYTE,
+#if defined(CONFIG_SOC_SERIES_APOLLO4X)
+	.caps = {
+		.no_explicit_erase = true,
+	},
+#endif
 };
 
 static bool flash_ambiq_valid_range(off_t offset, size_t len)