sysmobts2100: add RDEPENDS to required kernel modules

We need to makes sure that the dsp/fpga related kernel modules are
included in any image we generate. Use MACHINE_ESSENTIAL_EXTRA_RDEPENDS
just like in sysmobts.inc

Closes: SYS#3687

conf/machine/sysmobts2100.conf

@@ -1,6 +1,16 @@
 # sysmoBTS 2100 machine type, based on LC15
 require conf/machine/litecell15.conf
 
+MACHINE_ESSENTIAL_EXTRA_RDEPENDS = "\
+	${@['watchdog', ''][d.getVar('VIRTUAL-RUNTIME_init_manager', True) == 'systemd']} \
+	kernel-module-rpmsg-proto \
+	kernel-module-rpmsg-rpc \
+	kernel-module-nrw-clkerr \
+	kernel-module-nrw-vswr \
+	kernel-module-omap-remoteproc \
+	kernel-module-fpgadl \
+	"
+
 MACHINE_EXTRA_RDEPENDS = "\
 	task-sysmocom-bts \
 	${@['watchdog', ''][d.getVar('VIRTUAL-RUNTIME_init_manager', True) == 'systemd']} \