mb/google/nissa/var/pirrha: Increase VBT_DATA_SIZE_KB to 10

Increase VBT_DATA_SIZE_KB to 10 since pirrha uses bigger VBT file.
It includes MIPI power sequence data for panel.

BUG=b:295112773
BRANCH=nissa
TEST=FW_NAME=pirrha emerge-nissa coreboot

Change-Id: Ib6c293ccb4a8df3ebbd2271e7db2de4e7bd9cc3e
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77163
Reviewed-by: Derek Huang <derekhuang@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/Kconfig

@@ -368,4 +368,8 @@ config PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS
 	int
 	default 33
 
+config VBT_DATA_SIZE_KB
+	int
+	default 10 if BOARD_GOOGLE_PIRRHA
+
 endif # BOARD_GOOGLE_BRYA_COMMON