soc: espressif: place arch_common in IRAM for proper boot

Ensure sw_isr_common, dynamic_isr, and init routines are executed from IRAM
by relocating libarch__common.a section.

Running these from flash prevents the board from booting properly, as flash
access is not available during early initialization.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>