package/libcamera: fix install staging typo

This won't enable install to staging unless capitalized.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libcamera/libcamera.mk

@@ -16,7 +16,7 @@ LIBCAMERA_CONF_OPTS = \
 	-Dandroid=false \
 	-Ddocumentation=false \
 	-Dtest=false
-LIBCAMERA_INSTALL_STAGING = yes
+LIBCAMERA_INSTALL_STAGING = YES
 LIBCAMERA_LICENSE = \
 	LGPL-2.1+ (library), \
 	GPL-2.0+ (utils), \