warp7: Remove CONFIG_BOOTDELAY variable

It's not necessary anymore to declare the CONFIG_BOOTDELAY variable,
it's already set by default as 2 seconds.

Signed-off-by: Breno Lima <breno.lima@nxp.com>
Acked-by: Fabio Estevam <fabio.estevam@nxp.com>

configs/warp7_defconfig

@@ -4,7 +4,6 @@ CONFIG_TARGET_WARP7=y
 CONFIG_IMX_RDC=y
 CONFIG_IMX_BOOTAUX=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/warp7/imximage.cfg"
-CONFIG_BOOTDELAY=1
 CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_BOOTD is not set
 CONFIG_CMD_BOOTZ=y