stm32mp: correct the dependency for bootcount configs

Default value for CONFIG_SYS_BOOTCOUNT_SINGLEWORD and
CONFIG_SYS_BOOTCOUNT_ADDR are only needed when
CONFIG_BOOTCOUNT_GENERIC is used.

This patch avoids to define these configs when an other bootcount backend
is activated, for example for CONFIG_BOOTCOUNT_ENV.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/arch/arm/mach-stm32mp/Kconfig b/arch/arm/mach-stm32mp/Kconfig
index 1ed2aad..811c0fc 100644
--- a/arch/arm/mach-stm32mp/Kconfig
+++ b/arch/arm/mach-stm32mp/Kconfig
@@ -195,7 +195,7 @@
 config BOOTSTAGE_STASH_ADDR
 	default 0xC3000000
 
-if BOOTCOUNT_LIMIT
+if BOOTCOUNT_GENERIC
 config SYS_BOOTCOUNT_SINGLEWORD
 	default y