ARM: stm32: Set environment sector size to 4k on DHSOM

The DHSOM SPI NOR is using 4k erase blocks, make use of it
and define the default environment sector size to 4k.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

configs/stm32mp15_dhcom_basic_defconfig

@@ -4,6 +4,7 @@ CONFIG_SYS_MALLOC_F_LEN=0x3000
 CONFIG_SYS_MEMTEST_START=0xc0000000
 CONFIG_SYS_MEMTEST_END=0xc4000000
 CONFIG_ENV_SIZE=0x4000
+CONFIG_ENV_SECT_SIZE=0x1000
 CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp15xx-dhcom-pdk2"
 CONFIG_SPL_TEXT_BASE=0x2FFC2500
@@ -102,7 +103,6 @@ CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
-# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_SPI_FLASH_MTD=y
 CONFIG_DM_ETH=y
 CONFIG_DWC_ETH_QOS=y

configs/stm32mp15_dhcor_basic_defconfig

@@ -2,6 +2,7 @@ CONFIG_ARM=y
 CONFIG_ARCH_STM32MP=y
 CONFIG_SYS_MALLOC_F_LEN=0x3000
 CONFIG_ENV_SIZE=0x4000
+CONFIG_ENV_SECT_SIZE=0x1000
 CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="stm32mp15xx-dhcor-avenger96"
 CONFIG_SPL_TEXT_BASE=0x2FFC2500
@@ -97,7 +98,6 @@ CONFIG_SPI_FLASH_MACRONIX=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_SPI_FLASH_WINBOND=y
-# CONFIG_SPI_FLASH_USE_4K_SECTORS is not set
 CONFIG_SPI_FLASH_MTD=y
 CONFIG_DM_ETH=y
 CONFIG_DWC_ETH_QOS=y