refactor(st): move mbedtls config files

The files stm32mp_mbedtls_config-{2,3}.h are moved to
plat/st/common/include directory as they could be shared with other ST
platforms. Their prefixes are changed from stm32mp1 to stm32mp.

Signed-off-by: Yann Gautier <yann.gautier@st.com>
Change-Id: I86e39481b6c8d2689c59eb9a351b77b3d6233b08
diff --git a/plat/st/common/common.mk b/plat/st/common/common.mk
index b2df9e8..f69c901 100644
--- a/plat/st/common/common.mk
+++ b/plat/st/common/common.mk
@@ -183,11 +183,11 @@
 ${MBEDTLS_DIR}/include/mbedtls/*.h | grep -oe '\([0-9.]*\)')
 
 ifeq (${MBEDTLS_MAJOR}, 2)
-MBEDTLS_CONFIG_FILE		?=	"<stm32mp1_mbedtls_config-2.h>"
+MBEDTLS_CONFIG_FILE		?=	"<stm32mp_mbedtls_config-2.h>"
 endif
 
 ifeq (${MBEDTLS_MAJOR}, 3)
-MBEDTLS_CONFIG_FILE		?=	"<stm32mp1_mbedtls_config-3.h>"
+MBEDTLS_CONFIG_FILE		?=	"<stm32mp_mbedtls_config-3.h>"
 endif
 endif