Makefile: add pinebookpro targets

Makefile

@@ -5,10 +5,10 @@ SCRIPTS += $(SHIN:.sh.in=.sh)
 DATECODE=$(shell date "+%Y%m%d")
 SHELL=/bin/bash
 
-T_PLATFORMS=rpi{,2,3}{,-musl} beaglebone{,-musl} cubieboard2{,-musl} odroid-c2{,-musl} GCP{,-musl}
+T_PLATFORMS=rpi{,2,3}{,-musl} beaglebone{,-musl} cubieboard2{,-musl} odroid-c2{,-musl} GCP{,-musl} pinebookpro{,-musl}
 T_ARCHS=i686 x86_64{,-musl} armv{6,7}l{,-musl} aarch64{,-musl}
 
-T_SBC_IMGS=rpi{,2,3}{,-musl} beaglebone{,-musl} cubieboard2{,-musl} odroid-c2{,-musl}
+T_SBC_IMGS=rpi{,2,3}{,-musl} beaglebone{,-musl} cubieboard2{,-musl} odroid-c2{,-musl} pinebookpro{,-musl}
 T_CLOUD_IMGS=GCP{,-musl}
 
 T_PXE_ARCHS=x86_64{,-musl}