gfrg240_defconfig: gzip initramfs

Enable CONFIG_RD_GZIP to gzip the initramfs and significantly reduce the
size of vmlinux.bin. Previously, our system would not boot because
vmlinux.bin was too large.

U-Boot printed the following error message:

"Uncompressing Kernel Image ... LZMA: uncompress or overwrite error 1 -
must RESET board to recover"
diff --git a/arch/arc/configs/gfrg240_defconfig b/arch/arc/configs/gfrg240_defconfig
index 6dbbe40..5612d36 100644
--- a/arch/arc/configs/gfrg240_defconfig
+++ b/arch/arc/configs/gfrg240_defconfig
@@ -11,7 +11,6 @@
 # CONFIG_PID_NS is not set
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_INITRAMFS_SOURCE="/usr/local/google/home/danielmentz/hdd1/import_quantenna_kernel/rootfs.arc-linux-uclibc.cpio"
-# CONFIG_RD_GZIP is not set
 # CONFIG_RD_BZIP2 is not set
 # CONFIG_RD_LZMA is not set
 # CONFIG_RD_XZ is not set