ARM: socfpga: Disable D cache in SPL

The bootrom seems to leave the D-cache in messed up state, make sure
the SPL disables it so it can not interfere with operation.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Chin Liang See <chin.liang.see@intel.com>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Cc: Tien Fong Chee <tien.fong.chee@intel.com>

arch/arm/mach-socfpga/spl_a10.c

@@ -77,6 +77,8 @@ void spl_board_init(void)
 
 void board_init_f(ulong dummy)
 {
+	dcache_disable();
+
 	socfpga_init_security_policies();
 	socfpga_sdram_remap_zero();