fix(tegra210): mark bits [23:17] as zero for Fast SMCs

fix(tegra210): mark bits [23:17] as zero for Fast SMCs

Per SMCCC documentation, bits [23:17] must be zero for Fast
SMCs. Other values are reserved for future use. Ensure that
these bits are zeroes for TEGRA_SIP_PMC_COMMANDS.

Commit f8a35797 introduced a check to return error if these
bits are not zero, thus breaking Tegra210 platforms. This
patch fixes the anomaly.

Change-Id: I19edc3b33c999a6fee6b86184233fba146316466
Signed-off-by: Kalyani Chidambaram Vaidyanathan <kalyanic@nvidia.com>
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>