memory_info.h: Store SMBIOS error correction type

There are platforms that support error correction types other than
single-bit ECC. Extend meminfo to accomodate additional ECC types.

It is assumed that `struct memory_info` is packed to save space. Thus,
use `uint8_t` instead of an enum type (which are usually 4 bytes wide).

Change-Id: I863f8e34c84841d931dfb8d7067af0f12a437e36
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50178
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/arch/x86/smbios.c

@@ -445,8 +445,7 @@ static int get_socket_type(void)
 
 unsigned int __weak smbios_memory_error_correction_type(struct memory_info *meminfo)
 {
-	return meminfo->ecc_capable ?
-		MEMORY_ARRAY_ECC_SINGLE_BIT : MEMORY_ARRAY_ECC_NONE;
+	return meminfo->ecc_type;
 }
 
 unsigned int __weak smbios_processor_external_clock(void)