irqchip/renesas-rzg2l: Rename rzg2l_tint_eoi()

[ Upstream commit 7cb6362c

 ]

Rename rzg2l_tint_eoi()->rzg2l_clear_tint_int() and simplify the code by
removing redundant priv and hw_irq local variables.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Stable-dep-of: 853a6030

 ("irqchip/renesas-rzg2l: Prevent spurious interrupts when setting trigger type")
Signed-off-by: Sasha Levin <sashal@kernel.org>