Revert "ANDROID: irqchip/irq-gic-v3: Add vendor hook for gic suspend"

This reverts commit 81a6dfe2.

The symbols exported by it were never used by any external modules, so remove
the unneeded exports.

Bug: 203756332
Bug: 279879797
Cc: Nagireddy Annem <quic_nannem@quicinc.com>
Cc: Shreyas K K <quic_shrekk@quicinc.com>
Cc: Melody Olvera <quic_molvera@quicinc.com>
Change-Id: If4e41a5de09d25a13fbc5b1b9d6daeb064db9e9e
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>