arm/mach-hisi: remove legacy __CPUINIT section that crept in

We removed __cpuinit support (leaving no-op stubs) quite some time ago.
However a new instance was added in commit 06cc5c1d


("ARM: hisi: enable hix5hd2 SoC")

Since we want to clobber the stubs soon, get this removed now.
Note that there would normally be a corresponding removal of
a ".previous" directive, but in this case it appears that this
single function file was never paired off with one.

Cc: Haifeng Yan <yanhaifeng@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>