RPi-config: Rename recipe to rpi-config

This was done to avoid errors like:
| *** Error: Package name  contains illegal characters, (other than [a-z0-9.+-])
while using ipk.

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>

recipes-bcm/bootfiles/bcm2835-bootfiles.bb

@@ -5,7 +5,7 @@ LIC_FILES_CHKSUM = "file://LICENCE.broadcom;md5=e86e693d19572ee64cc8b17fb062faa9
 
 include ../common/firmware.inc
 
-RDEPENDS_${PN} = "RPi-config"
+RDEPENDS_${PN} = "rpi-config"
 
 COMPATIBLE_MACHINE = "raspberrypi"