soc/intel/meteorlake: Increase cbmem buffer size to 256KB

Current size of the cbmem buffer (128KB) is insufficient to contain the
complete debug logs which is more than 166KB hence, cbmem console buffer has wound off to contain the maximum possible debug messages within the allocated buffer as results, we are seeing truncated debug message while looking into the cbmem console.

This patch increases cbmem buffer size to 256KB so that the complete
debug log can be stored in it.

BUG=b:265683565
TEST=Make sure that logs from all the boot stages can be seen using
'cbmem -c'.

Signed-off-by: Kapil Porwal <kapilporwal@google.com>
Change-Id: Ibeabb61d60491b831252b7161c9d3181fbe09e73
Reviewed-on: https://review.coreboot.org/c/coreboot/+/72047
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Usha P <usha.p@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/meteorlake/Kconfig

@@ -296,6 +296,10 @@ config PRERAM_CBMEM_CONSOLE_SIZE
 	hex
 	default 0x2000
 
+config CONSOLE_CBMEM_BUFFER_SIZE
+	hex
+	default 0x40000
+
 config FSP_HEADER_PATH
 	string "Location of FSP headers"
 	default "src/vendorcode/intel/fsp/fsp2_0/meteorlake/"