boards: x86: acrn_ehl_crb: fix config Apic timer IRQ value
boards: x86: acrn_ehl_crb: fix config Apic timer IRQ value

The default APIC_TIMER_IRQ of 24 causes significant slowdown
in general tests and samples execution on this board. As the
value of ioapic RTEs increases, e.g. 48 in ACRN EHL CRB, the
APIC TIMER IRQ is stepped on. This commit tunes the config
for APIC_TIMER_IRQ to 48 for this board.

Fixes #33593

Signed-off-by: Jennifer Williams <7953176682adde4345743ea99dbf2682fb898b9d@intel.com>

nashif/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,galak/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,finikorg/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr