soc: sunxi_sram: Make use of the helper function devm_platform_ioremap_resource()

[ Upstream commit 1f3753a5

 ]

Use the devm_platform_ioremap_resource() helper instead of
calling platform_get_resource() and devm_ioremap_resource()
separately

Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210908071716.772-1-caihuoqing@baidu.com
Stable-dep-of: 49fad91a

 ("soc: sunxi: sram: Fix probe function ordering issues")
Signed-off-by: Sasha Levin <sashal@kernel.org>