ARM64: Remove incorrect Kconfig symbol HAVE_SPARSE_IRQ

Kernel does not contain symbol HAVE_SPARSE_IRQ. Definition
in arch/arm64/Kconfig seems typo because valid symbol is
MAY_HAVE_SPARSE_IRQ.
In any case SPARSE_IRQ is selected by default and we just
remove selecting of this symbol.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>