soc/intel/common/block/sgx/Kconfig: Add missing default symbol

default SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE value is missing by
accident for SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE_32MB.

Change-Id: Ib3af0a1c509ab2e2eccf3e36ff604a1040995af4
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69332
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
diff --git a/src/soc/intel/common/block/sgx/Kconfig b/src/soc/intel/common/block/sgx/Kconfig
index 92959ff..d9f941d 100644
--- a/src/soc/intel/common/block/sgx/Kconfig
+++ b/src/soc/intel/common/block/sgx/Kconfig
@@ -30,6 +30,7 @@
 	default 256 if SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE_256MB
 	default 128 if SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE_128MB
 	default  64 if SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE_64MB
+	default  32 if SOC_INTEL_COMMON_BLOCK_SGX_PRMRR_SIZE_32MB
 
 choice
 	prompt "PRMRR size"