17830: periph/timer: fix Kconfig menu title r=aabadie a=gschorcht
### Contribution description
This PR is a very small fix of inconsistent peripheral driver entry in `Kconfig` for `periph/timer`.
In Kconfig menu `(Top) → Drivers → Peripherals drivers` all entries start with the peripheral name in alphabetical order with only one exception, the timer entry. This entry is called `Configure timer peripheral driver`:
```
[ ] CPU unique ID
[ ] EEPROM peripheral driver
[ ] Flashpage peripheral driver ----
[*] GPIO peripheral driver --->
[ ] HWRNG peripheral driver
[ ] PWM peripheral driver
[*] Power Management (PM) peripheral driver
[*] Auto initialize Power Management (PM) peripheral
[ ] Quadrature Decoder (QDEC) peripheral driver
[ ] RTC peripheral driver ----
[ ] SPI peripheral driver ----
[*] UART peripheral driver --->
[*] Configure timer peripheral driver --->
```
This is confusing and doesn't help to find the right entry. This PR
1. changes the entry to `Timer peripheral driver` and
2. corrects the alphabetical order.
### Testing procedure
Use command
```
TEST_KCONFIG=1 make -C tests/periph_timer menuconfig
```
and check the output. in menu `(Top) → Drivers → Peripherals drivers`. It should be with this PR:
```
[ ] CPU unique ID
[ ] EEPROM peripheral driver
[ ] Flashpage peripheral driver ----
[*] GPIO peripheral driver --->
[ ] HWRNG peripheral driver
[ ] PWM peripheral driver
[*] Power Management (PM) peripheral driver
[*] Auto initialize Power Management (PM) peripheral
[ ] Quadrature Decoder (QDEC) peripheral driver
[ ] RTC peripheral driver ----
[ ] SPI peripheral driver ----
[*] Timer peripheral driver --->
[*] UART peripheral driver --->
```
### Issues/PRs references
19635: drivers/mrf24j40: cleanup function r=aabadie a=maribu
### Contribution description
`_set_csma_params()` spends some time to prepare a value in `uint8_t tmp`, which then is never used. Likely this is a leftover of moving code to `mrf24j40_set_csma_max_retries()`. This drops the leftover code.
Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
Co-authored-by: Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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