MIPS: cevt-r4k: Migrate to new 'set-state' interface

Migrate cevt-4k driver to the new 'set-state' interface provided by
clockevents core, the earlier 'set-mode' interface is marked obsolete
now.

This also enables us to implement callbacks for new states of clockevent
devices, for example: ONESHOT_STOPPED.

We weren't doing anything in the ->set_mode() callback. So, this patch
doesn't provide any set-state callbacks.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Andrew Bresticker <abrestic@chromium.org>
Cc: Qais Yousef <qais.yousef@imgtec.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-mips@linux-mips.org
Cc: linaro-kernel@lists.linaro.org
Cc: Thomas Gleixner <tglx@linutronix.de>
Patchwork: https://patchwork.linux-mips.org/patch/10605/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS: cevt-r4k: Move handle_perf_irq() out of header

Long ago, commit 8531a35e5e27 ("[MIPS] SMTC: Fix SMTC dyntick support.")
moved handle_perf_irq() out of cevt-r4k.c into a header so it could be
shared with cevt-smtc.c.

Slightly less long ago, commit b633648c5ad3 ("MIPS: MT: Remove SMTC
support") removed all traces of SMTC support, including cevt-smtc.c,
leaving cevt-r4k.c once again the sole user of handle_perf_irq(),
therefore move it back into cevt-r4k.c from the header.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/9123/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS: MSP: Fix build error

Reported and original patch by Yoichi Yuasa <yuasa@linux-mips.org>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS: Have a heart for a lonely, lost header file ...

... and move it to where all its brothers and sisters reside. Requested by
Shane McDonald <mcdonald.shane@gmail.com>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>