linux-variscite: Updated to latest revision

Added the following commits:

d2157572b98 Revert "ARM: dts: imx6ul-var-dart/som-nand: Drop the
            redundant fsl,legacy-bch-geometry property"
9f035dc5774 mtd: rawnand: gpmi: add support for legacy-bch-geometry
4932de925ca ubifs: Fix ubifs_tnc_lookup() usage in do_kill_orphans()
f7155e92655 ARM: imx: mach-imx6ul: fix enet init support
b79cd8b5a72 arm: imx: fix imx6_enet_mac_init logic
d6f8d3f0df3 video: fbdev: mxsfb: fix video mem size detection

Signed-off-by: Pierluigi Passaro <pierluigi.p@variscite.com>

recipes-kernel/linux/linux-common.inc

@@ -1,3 +1,3 @@
 SRCBRANCH = "lf-5.4.y_var01"
-SRCREV = "654af11a644bec502325f266ba1afc31348487d8"
+SRCREV = "d2157572b98209436a573df0b0c402a99324b49a"
 KERNEL_SRC = "git://github.com/varigit/linux-imx;protocol=git"