Fix generic_x86 image sizes.

The image build tools only accept decimals.

Change-Id: I4fc3d32a9528bdad4cfb9381cff344a1a1b6b6d5
diff --git a/target/board/generic_x86/BoardConfig.mk b/target/board/generic_x86/BoardConfig.mk
index 83c2da0..83a8c3e 100644
--- a/target/board/generic_x86/BoardConfig.mk
+++ b/target/board/generic_x86/BoardConfig.mk
@@ -20,9 +20,9 @@
 BOARD_BOOTIMAGE_MAX_SIZE := 8388608
 BOARD_SYSLOADER_MAX_SIZE := 7340032
 BOARD_FLASH_BLOCK_SIZE := 512
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 150M
-BOARD_USERDATAIMAGE_PARTITION_SIZE := 50M
-BOARD_INSTALLERIMAGE_PARTITION_SIZE := 500M
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 157286400
+BOARD_USERDATAIMAGE_PARTITION_SIZE := 52428800
+BOARD_INSTALLERIMAGE_PARTITION_SIZE := 524288000
 TARGET_USERIMAGES_SPARSE_EXT_DISABLED := true