can: flexcan: disable all IRQ lines in flexcan_chip_interrupts_enable()

flexcan_chip_interrupts_enable() disables only the primary IRQ line while
writing to the IMASK and CTRL registers.

On multi-IRQ platforms (S32G2, MCF5441X), the additional IRQ lines (boff,
err, secondary-mb) remain active so their handlers can fire while
registers are inconsistent.

Disable all registered IRQ lines around the IMASK/CTRL writes. This
also fixes the resume path, which calls this function.

Signed-off-by: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
Link: https://patch.msgid.link/20260326135825.3428856-3-ciprianmarian.costea@oss.nxp.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>