efi_loader: increase eventlog buffer size

TCG PC Client PFP spec says "The Log Area Minimum Length
for the TCG event log MUST be at least 64KB." in ACPI chapter.
This commit increase the buffer size to 64KB.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/Kconfig

@@ -327,7 +327,7 @@ config EFI_TCG2_PROTOCOL
 config EFI_TCG2_PROTOCOL_EVENTLOG_SIZE
 	int "EFI_TCG2_PROTOCOL EventLog size"
 	depends on EFI_TCG2_PROTOCOL
-	default 4096
+	default 65536
 	help
 		Define the size of the EventLog for EFI_TCG2_PROTOCOL. Note that
 		this is going to be allocated twice. One for the eventlog it self