memory: Add LPDDR2-info helpers

[ Upstream commit 38322cf4 ]

Add common helpers for reading and parsing standard LPDDR2 configuration
properties.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20211006224659.21434-9-digetx@gmail.com


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Stable-dep-of: b9784e5c ("memory: tegra20-emc: fix an OF node reference bug in tegra_emc_find_node_by_ram_code()")
Signed-off-by: Sasha Levin <sashal@kernel.org>