CONFIG_NR_DRAM_BANKS: Remove unreferenced code as its always defined

Since commit 86cf1c8285 ("configs: Migrate CONFIG_NR_DRAM_BANKS") &
commit 999a772d9f ("Kconfig: Migrate CONFIG_NR_DRAM_BANKS"),
CONFIG_NR_DRAM_BANKS is always defined with a value (4 is default).
It makes no sense to still carry code that is guarded with
"#ifndef CONFIG_NR_DRAM_BANKS" (and similar). This patch removes
all these unreferenced code paths.

Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

include/handoff.h

@@ -20,12 +20,10 @@
 struct spl_handoff {
 	struct arch_spl_handoff arch;
 	u64 ram_size;
-#ifdef CONFIG_NR_DRAM_BANKS
 	struct {
 		u64 start;
 		u64 size;
 	} ram_bank[CONFIG_NR_DRAM_BANKS];
-#endif
 };
 
 void handoff_save_dram(struct spl_handoff *ho);