Revert "ANDROID: disable BLK_DEV_NBD for allmodconfig"

This reverts commit ca7dad50d4.

This re-enabled coverage of BLK_DEV_NBD. The clang-13 bug was worked
around in
commit 41e76c6a3c ("nbd: use shifts rather than multiplies")

Bug: 199191028
Link: https://github.com/ClangBuiltLinux/linux/issues/1438
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Change-Id: Ifcb6131e5c8b12e4c784320adac639b573198b1f

build.config.allmodconfig

@@ -7,7 +7,6 @@ function update_config() {
     ${KERNEL_DIR}/scripts/config --file ${OUT_DIR}/.config \
          -d TEST_KMOD  \
          -e UNWINDER_FRAME_POINTER \
-         -d BLK_DEV_NBD \
 	 -d INFINIBAND_QIB \
 
     (cd ${OUT_DIR} && \