tegra-common: add TEGRA_FLASH_CHECK variables

Starting with the BOARDID and BOARDSKU variables.
For our purposes, they need to be fixed at build time,
and if they don't match the actual target machine, we'll
get difficult-to-diagnose boot failures.

Signed-off-by: Matt Madison <matt@madison.systems>

conf/machine/include/tegra-common.inc

@@ -119,6 +119,9 @@ TEGRA_SIGNING_ENV ?= "CHIPREV=${TEGRA_CHIPREV} BOARDID=${TEGRA_BOARDID} FAB=${TE
 
 TEGRA_FLASHVARS ?= "BPFDTB_FILE BPF_FILE BR_CMD_CONFIG CHIP_SKU DEVICEPROD_CONFIG DEVICE_CONFIG DEV_PARAMS DEV_PARAMS_B EMC_FUSE_DEV_PARAMS GPIOINT_CONFIG MB2BCT_CFG MINRATCHET_CONFIG MISC_CONFIG PINMUX_CONFIG PMC_CONFIG PMIC_CONFIG PROD_CONFIG SCR_CONFIG RAMCODE TBCDTB_FILE UPHY_CONFIG WB0SDRAM_BCT"
 TEGRA_FLASHVAR_TBCDTB_FILE ?= "@DTBFILE@"
+TEGRA_FLASH_CHECK_VARS ?= "BOARDID BOARDSKU"
+TEGRA_FLASH_CHECK_BOARDID ?= "${TEGRA_BOARDID}"
+TEGRA_FLASH_CHECK_BOARDSKU ?= "${TEGRA_BOARDSKU}"
 
 EMMC_BCTS ?= "${EMMC_BCT}${@',' + d.getVar('EMMC_BCT_OVERRIDE') if d.getVar('EMMC_BCT_OVERRIDE') else ''}"