armv8/fsl-layerscape: Update CONFIG_LS2080A to CONFIG_FSL_LSCH3

Update CONFIG_LS2080A to CONFIG_FSL_LSCH3 to make those workaround
implementing of erratum reusable for more SoCs.

Signed-off-by: Shengzhou Liu <Shengzhou.Liu@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>