stm32mp1: cosmetic cleanup Kconfig

Cosmetic cleanup in mach-stm32mp Kconfig
- remove duplicated SPL_DRIVERS_MISC_SUPPORT
- update help for TARGET_STM32MP1
- set value for NR_DRAM_BANKS
- remove one comment as DEBUG_UART is deactivated by default
- include board Kconfig at the end of the file

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index d70658a..73aa382 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -17,7 +17,6 @@
 	select SPL_DM_RESET
 	select SPL_SERIAL_SUPPORT
 	select SPL_SYSCON
-	select SPL_DRIVERS_MISC_SUPPORT
 	imply SPL_DISPLAY_PRINT
 	imply SPL_LIBDISK_SUPPORT
 
@@ -38,7 +37,9 @@
 	imply SYSRESET_SYSCON if !STM32MP1_TRUSTED
 	help
 		target STMicroelectronics SOC STM32MP1 family
+		STM32MP157, STM32MP153 or STM32MP151
 		STMicroelectronics MPU with core ARMv7
+		dual core A7 for STM32MP157/3, monocore for STM32MP151
 
 config STM32MP1_TRUSTED
 	bool "Support trusted boot with TF-A"
@@ -58,6 +59,9 @@
 		when DDR driver is used:
 		  DDR + 1MB (0xC0100000)
 
+config NR_DRAM_BANKS
+	default 1
+
 config SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION_MMC2
 	hex "Partition on MMC2 to use to load U-Boot from"
 	depends on SYS_MMCSD_RAW_MODE_U_BOOT_USE_PARTITION
@@ -66,9 +70,6 @@
 	  Partition on the second MMC to load U-Boot from when the MMC is being
 	  used in raw mode
 
-source "board/st/stm32mp1/Kconfig"
-
-# currently activated for debug / should be deactivated for real product
 if DEBUG_UART
 
 config DEBUG_UART_BOARD_INIT
@@ -83,4 +84,6 @@
 	default 64000000
 endif
 
+source "board/st/stm32mp1/Kconfig"
+
 endif