initramfs-module-install: remove loongarch64 from COMPATIBLE_HOST

initramfs-module-install: remove loongarch64 from COMPATIBLE_HOST

Due to initramfs-module-install runtime depend on grub, and grub did not
support loongarch64, remove loongarch64 from COMPATIBLE_HOST

$ echo "MACHINE = 'qemuloongarch64'" >> conf/local.conf
$ bitbake world
|ERROR: Nothing RPROVIDES 'grub' (but oe-core/meta/recipes-core/initrdscripts/
initramfs-module-install_1.0.bb RDEPENDS on or otherwise requires it)
|grub was skipped: incompatible with host loongarch64-wrs-linux (not in
COMPATIBLE_HOST)
|NOTE: Runtime target 'grub' is unbuildable, removing...
|Missing or unbuildable dependency chain was: ['grub']
|ERROR: Required build target 'meta-world-pkgdata' has no buildable providers.
|Missing or unbuildable dependency chain was: ['meta-world-pkgdata',
'initramfs-module-install', 'grub']

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>