ARM: dts: am335x: Guardian: Update beeper label

[ Upstream commit b5bf6b43 ]

 * Update lable pwm to guardian beeper

Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com>
Message-Id: <20220325100613.1494-8-Gireesh.Hiremath@in.bosch.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Stable-dep-of: ac08bda1 ("ARM: dts: ti: omap: motorola-mapphone: Fix abe_clkctrl warning on boot")
Signed-off-by: Sasha Levin <sashal@kernel.org>