drivers/perf: Remove usage of the deprecated ida_simple_xx() API

ida_alloc() and ida_free() should be preferred to the deprecated
ida_simple_get() and ida_simple_remove().

This is less verbose.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/85b0b73a1b2f743dd5db15d4765c7685100de27f.1702230488.git.christophe.jaillet@wanadoo.fr


Signed-off-by: Will Deacon <will@kernel.org>