Inline LL_Init1msTick to omit division code

[sw]

Reduce flash footprint by inlining LL_Init1msTick so that the SysTick LOAD register value can be calculated by the compiler, if constant frequency values are used.

Code size for Examples/PY32F002B/LL/GPIO/GPIO_Toggle

Before:

Memory region         Used Size  Region Size  %age Used
             RAM:         800 B         3 KB     26.04%
           FLASH:        1144 B        24 KB      4.65%

After:

Memory region         Used Size  Region Size  %age Used
             RAM:         800 B         3 KB     26.04%
           FLASH:         852 B        24 KB      3.47%

[mrx23dot]

you should be using SysTick_Config(uint32_t ticks)

[sw]

SysTick_Config does a bit more than LL_InitTick, though: it sets the SysTick_IRQn priority and enables the SysTick_CTRL_TICKINT flag. I don't think we necessarily want the tick interrupt enabled?