grub-2.00: remove our 40_custom

We have this in recipes-bsp/grub/grub/40_custom:

[snip]
menuentry "Linux" {
    set root=(hd0,1)
    linux /vmlinuz root=__ROOTFS__ rw __CONSOLE__ __VIDEO_MODE__ __VGA_MODE__ quiet
}
[snip]

These lines are only for initrdscripts/files/init-install.sh, the side
effect is that it would make the target's grub-mkconfig doesn't work
well since the 40_custom will be installed to /etc/grub.d/40_custom, the
grub-mkconfig will run the 40_custom, and there will always be a
'menuentry "Linux"' menu in grub.cfg no matter it is valid or not, we
can do this in init-install.sh rather than grub to fix the problem,
which is also much simpler.

We have done the related work in init-install.sh, now we need remove our own
40_custom, and use grub's own 40_custom which is the right one.

(From OE-Core rev: 4fad24fef5552bd0e4a5ea0982573ba8e4523570)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Roy Li <rongqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-bsp/grub/grub_git.bb

@@ -19,7 +19,6 @@ DEFAULT_PREFERENCE_arm = "1"
 PV = "2.00+${SRCPV}"
 SRCREV = "4b8b9135f1676924a8458da528d264bbc7bbb301"
 SRC_URI = "git://git.savannah.gnu.org/grub.git \
-           file://40_custom \
            file://autogen.sh-exclude-pc.patch \
            file://grub-2.00-add-oe-kernel.patch \
            file://asciih-fix-build-warning-error.patch \
@@ -52,7 +51,6 @@ do_configure_prepend() {
 
 do_install_append () {
     install -d ${D}${sysconfdir}/grub.d
-    install -m 0755 ${WORKDIR}/40_custom ${D}${sysconfdir}/grub.d/40_custom
  
 }