fairphone-fp2: add swclock-offset dependency (MR 3767)

The device has a standard read-only Qualcomm RTC, so time without
swclock-offset will always be wrong after reboot.

device/testing/device-fairphone-fp2/APKBUILD

@@ -1,8 +1,8 @@
 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-fairphone-fp2
 pkgdesc="Fairphone 2"
-pkgver=6
-pkgrel=1
+pkgver=7
+pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"
@@ -10,6 +10,7 @@ options="!check !archcheck"
 depends="
 	mkbootimg
 	postmarketos-base
+	swclock-offset
 	"
 makedepends="devicepkg-dev"
 source="deviceinfo