soc: psoc6: kconfig: Do not select CPU_CORTEX_M_HAS_DWT on Cortex-M0

CPU_CORTEX_M_HAS_DWT depends on

    !CPU_CORTEX_M0 && !CPU_CORTEX_M0PLUS

, but SOC_SERIES_PSOC62 unconditionally selects it, even for
SOC_PSOC6_M0. This forces CPU_CORTEX_M_HAS_DWT on on Cortex-M0.

Fix it by moving the selects for CPU capabilities to the more specific
SOC_PSOC6_{M0,M4} symbols. This seems more readable than adding a
condition to the 'select CPU_CORTEX_M_HAS_DWT'.

Signed-off-by: Ulf Magnusson <Ulf.Magnusson@nordicsemi.no>