payloads/edk2: Fix typo in Make command

The Makefile was passing `CONFIG_SMMSTORE_v2` which doesn't exist.

Correct this to `CONFIG_SMMSTORE_V2`.

Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I984d2155143c14cb4a347ed24688b9ea492f7f8b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76317
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@gmail.com>
diff --git a/payloads/external/Makefile.inc b/payloads/external/Makefile.inc
index e367cb8..33df6fb 100644
--- a/payloads/external/Makefile.inc
+++ b/payloads/external/Makefile.inc
@@ -187,7 +187,7 @@
 		CONFIG_ECAM_MMCONF_LENGTH=$(CONFIG_ECAM_MMCONF_LENGTH) \
 		CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS=$(CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS) \
 		CONFIG_CPU_XTAL_HZ=$(CONFIG_CPU_XTAL_HZ) \
-		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_v2) \
+		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_V2) \
 		CONFIG_EDK2_SECURE_BOOT_SUPPORT=$(CONFIG_EDK2_SECURE_BOOT_SUPPORT) \
 		GCC_CC_x86_32=$(GCC_CC_x86_32) \
 		GCC_CC_x86_64=$(GCC_CC_x86_64) \
@@ -229,7 +229,7 @@
 		CONFIG_ECAM_MMCONF_BASE_ADDRESS=$(CONFIG_ECAM_MMCONF_BASE_ADDRESS) \
 		CONFIG_ECAM_MMCONF_LENGTH=$(CONFIG_ECAM_MMCONF_LENGTH) \
 		CONFIG_CPU_XTAL_HZ=$(CONFIG_CPU_XTAL_HZ) \
-		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_v2) \
+		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_V2) \
 		GCC_CC_x86_32=$(GCC_CC_x86_32) \
 		GCC_CC_x86_64=$(GCC_CC_x86_64) \
 		GCC_CC_arm=$(GCC_CC_arm) \