irqchip/renesas-rzg2l: Rename rzg2l_irq_eoi()

irqchip/renesas-rzg2l: Rename rzg2l_irq_eoi()

[ Upstream commit b4b5cd61a6fdd92ede0dc39f0850a182affd1323 ]

Rename rzg2l_irq_eoi()->rzg2l_clear_irq_int() and simplify the code by
removing redundant priv local variable.

Suggested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Stable-dep-of: 853a6030303f ("irqchip/renesas-rzg2l: Prevent spurious interrupts when setting trigger type")
Signed-off-by: Sasha Levin <sashal@kernel.org>