efm32: Split efm32/lg into /lg and /common.

Somewhat replaces some earlier work done by hg/lg, but much more
complete, so we kept it as is, because it's bringing in even more parts
after this.

Reviewed-by: Karl Palsson <karlp@tweak.net.au>

lib/efm32/common/timer_common.c

@@ -47,7 +47,7 @@ void timer_stop(uint32_t timer)
 void timer_set_clock_prescaler(uint32_t timer, uint32_t presc)
 {
 	TIMER_CTRL(timer) = (TIMER_CTRL(timer) & ~TIMER_CTRL_PRESC_MASK)
-			    | presc;
+			    | TIMER_CTRL_PRESC(presc);
 }
 
 /**

lib/efm32/hg/Makefile

@@ -40,7 +40,7 @@ TGT_CFLAGS	+= $(STANDARD_FLAGS)
 
 ARFLAGS		= rcs
 
-OBJS		= cmu.o gpio_common_hglg.o timer_common_hglg.o
+OBJS		= cmu.o gpio_common.o timer_common.o
 OBJS		+= usb.o usb_control.o usb_standard.o usb_msc.o \
 		   usb_dwc_common.o usb_efm32hg.o
 

lib/efm32/lg/Makefile

@@ -40,8 +40,12 @@ TGT_CFLAGS	+= $(STANDARD_FLAGS)
 ARFLAGS		= rcs
 OBJS		=
 
-OBJS		= gpio_common_hglg.o timer_common_hglg.o cmu.o prs.o adc.o dma.o dac.o
-OBJS		+= usb.o usb_control.o usb_standard.o usb_efm32lg.o
+OBJS		= gpio_common.o cmu_common.o prs_common.o
+OBJS		+= adc_common.o dma_common.o timer_common.o
+OBJS		+= dac_common.o
+
+OBJS            += usb.o usb_control.o usb_standard.o
+OBJS            += usb_efm32.o
 
 VPATH += ../../usb:../:../../cm3:../common