rpi: Enable DRAM bank initialization on arm64

Up to now we only update the DRAM banks when we are define
CONFIG_BCM2711. But our one binary approach uses a config that supports
BCM2837 and BCM2711. As a result we only see one gibibyte of RAM on
Raspberry Pi 4, even if it has more RAM.
Fix this by calling dram_init_banksize.

Fixes: 56940906 ("ARM: defconfig: add unified config for RPi3 and RPi4")
Signed-off-by: NMatthias Brugger <mbrugger@suse.com>

board/raspberrypi/rpi/rpi.c

@@ -272,7 +272,6 @@ int dram_init(void)
 }
 
 #ifdef CONFIG_OF_BOARD
-#ifdef CONFIG_BCM2711
 int dram_init_banksize(void)
 {
 	int ret;
@@ -284,7 +283,6 @@ int dram_init_banksize(void)
 	return fdtdec_setup_mem_size_base();
 }
 #endif
-#endif
 
 static void set_fdtfile(void)
 {