Convert CONFIG_SPL_HASH_SUPPORT to Kconfig

Move this option to Kconfig and tidy up existing uses.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/include/asm/fsl_secure_boot.h b/arch/arm/include/asm/fsl_secure_boot.h
index b9aad04..ddc77a5 100644
--- a/arch/arm/include/asm/fsl_secure_boot.h
+++ b/arch/arm/include/asm/fsl_secure_boot.h
@@ -27,7 +27,6 @@
 #endif
 
 #define CONFIG_SPL_BOARD_INIT
-#define CONFIG_SPL_HASH_SUPPORT
 #define CONFIG_SPL_DRIVERS_MISC_SUPPORT
 #ifdef CONFIG_SPL_BUILD
 /*
diff --git a/arch/powerpc/include/asm/fsl_secure_boot.h b/arch/powerpc/include/asm/fsl_secure_boot.h
index 8fa1908..ae50b86 100644
--- a/arch/powerpc/include/asm/fsl_secure_boot.h
+++ b/arch/powerpc/include/asm/fsl_secure_boot.h
@@ -80,7 +80,6 @@
 
 #ifdef CONFIG_CHAIN_OF_TRUST
 
-#define CONFIG_SPL_HASH_SUPPORT
 #define CONFIG_SPL_DRIVERS_MISC_SUPPORT
 
 #ifdef CONFIG_SPL_BUILD
diff --git a/configs/T1042RDB_PI_NAND_SECURE_BOOT_defconfig b/configs/T1042RDB_PI_NAND_SECURE_BOOT_defconfig
index 5f6c84b..cbc7083 100644
--- a/configs/T1042RDB_PI_NAND_SECURE_BOOT_defconfig
+++ b/configs/T1042RDB_PI_NAND_SECURE_BOOT_defconfig
@@ -9,6 +9,7 @@
 CONFIG_BOOTDELAY=0
 CONFIG_SPL=y
 CONFIG_SPL_CRYPTO_SUPPORT=y
+CONFIG_SPL_HASH_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_MMC=y
diff --git a/configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig b/configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig
index e6e4f82..3316efa 100644
--- a/configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig
+++ b/configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig
@@ -8,6 +8,7 @@
 CONFIG_BOOTDELAY=0
 CONFIG_SPL=y
 CONFIG_SPL_CRYPTO_SUPPORT=y
+CONFIG_SPL_HASH_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GREPENV=y