soc: samsung: pmu: drop EXYNOS_CENTRAL_SEQ_OPTION defines

The defines for Exynos5 CENTRAL_SEQ_OPTION (e.g.
EXYNOS5_USE_STANDBYWFI_ARM_CORE1) are not used.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Link: https://lore.kernel.org/r/20210525184716.119663-1-krzysztof.kozlowski@canonical.com