meson: convert pc-bios/keymaps/Makefile

Note that sl and sv keymaps were not created by qemu-keymap.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/pc-bios/meson.build b/pc-bios/meson.build
index 6e3bfe3..b6389f5 100644
--- a/pc-bios/meson.build
+++ b/pc-bios/meson.build
@@ -25,3 +25,4 @@
 endif
 
 subdir('descriptors')
+subdir('keymaps')