arch: Add support for dynamically disconnecting shared interrupts

This commit provides the users a way to disconnect dynamic
interrupts. This is needed because we don't want to keep
piling up ISR/arg pairs until the number of registrable
clients is reached.

This feature is only relevant for shared and dynamic interrupts.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>