mb/google/nissa/var/anraggar: Disable SDCard controller

1. Anraggar doesn't support SDCard, so disable SDCard contorller.
2. Not disabling it will cause can't enter S0ix on first suspend.

BUG=b:313585586
TEST=1. check lspci
     2. can enter S0ix on first suspend

Change-Id: Ie4747d9c5d6ae93d29ef78b629855e0dd320c4db
Signed-off-by: Weimin Wu <wuweimin@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79586
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <ericllai@google.com>

src/mainboard/google/brya/variants/anraggar/overridetree.cb

@@ -499,6 +499,7 @@ chip soc/intel/alderlake
 				end
 			end
 		end
+		device ref pcie_rp7 off end # SDCard
 		device ref hda on
 			chip drivers/sof
 				register "spkr_tplg" = "rt5650_sp"