Turn off tickless for the NCS36510

The NCS36510 is not suitable for tickless, since its LP ticker cannot
be scheduled fast enough. This is because it takes four 32KHz clock
cycles before these writes take effect - ~120us.

Author: c1728p9

targets/targets.json

@@ -3195,7 +3195,7 @@
         },
         "OUTPUT_EXT": "hex",
         "post_binary_hook": {"function": "NCS36510TargetCode.ncs36510_addfib"},
-        "macros": ["CM3", "CPU_NCS36510", "TARGET_NCS36510", "LOAD_ADDRESS=0x3000", "MBED_TICKLESS"],
+        "macros": ["CM3", "CPU_NCS36510", "TARGET_NCS36510", "LOAD_ADDRESS=0x3000"],
         "supported_toolchains": ["GCC_ARM", "ARM", "IAR"],
         "device_has": ["ANALOGIN", "SERIAL", "I2C", "INTERRUPTIN", "PORTIN", "PORTINOUT", "PORTOUT", "PWMOUT", "RTC", "SERIAL", "SERIAL_FC", "SLEEP", "SPI", "LOWPOWERTIMER", "TRNG", "SPISLAVE"],
         "release_versions": ["2", "5"]