am33xx: Remove board/ti/am335x/evm.c

The intention has always been (and boards are to support) an i2c EEPROM
that will identify what hardware they are, allowing a single binary to
support multiple boards.  As such, remove the 'evm.c' file as there is
nothing EVM centric in it currently, only SoC peripheral configuration.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/board/ti/am335x/Makefile b/board/ti/am335x/Makefile
index d58b185..e3609bc 100644
--- a/board/ti/am335x/Makefile
+++ b/board/ti/am335x/Makefile
@@ -18,7 +18,7 @@
 
 LIB	= $(obj)lib$(BOARD).o
 
-COBJS	:= evm.o mux.o
+COBJS	:= mux.o
 
 SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))