irqchip/imx-mu-msi: Fix codingstyle in imx_mu_msi_domains_init()

Fixes the coding style of irq_domain_create_linear() call within
imx_mu_msi_domains_init() for better code readability.

Signed-off-by: Anna-Maria Behnsen <anna-maria@linutronix.de>
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240614102403.13610-3-shivamurthy.shastri@linutronix.de