wireless/cc1101: Make SPI burst and single frequencies configurable

[AuroraRAS]

Summary

This PR makes the SPI communication frequencies for the CC1101 wireless driver configurable via Kconfig.

Previously, CC1101_SPIFREQ_BURST and CC1101_SPIFREQ_SINGLE were hardcoded to 6.5 MHz and 9.0 MHz in drivers/wireless/cc1101.c. While these defaults work well for many typical setups, they can cause stability issues on sub-optimal hardware. Platforms with higher routing capacitance, long trace lines, or those that utilize internal GPIO switching matrices (such as the ESP32) can severely degrade SPI signal integrity, causing the CC1101 driver initialization to fail.

This change introduces CONFIG_CC1101_SPIFREQ_BURST and CONFIG_CC1101_SPIFREQ_SINGLE into drivers/wireless/Kconfig and updates the C source file to use these definitions. The original hardcoded values are preserved as the fallback defaults to ensure backward compatibility for existing users.

Impact

• Build: Adds CONFIG_CC1101_SPIFREQ_BURST and CONFIG_CC1101_SPIFREQ_SINGLE to the configuration menu under the CC1101 driver settings.
• Runtime: No change to the default runtime behavior. If users modify the values in make menuconfig, the SPI clock speed during CC1101 access will adjust accordingly.
• Hardware/Architecture: Architecture-independent. Applies to any hardware utilizing the CC1101 driver, especially beneficial for platforms with restrictive IO constraints.
• API: None.

Testing

• Build Testing: Verified that NuttX builds successfully with the default configuration (falling back to the standard 6.5 MHz / 9.0 MHz) and when custom frequencies are specified.
• Hardware Testing: Tested on a platform utilizing an internal GPIO matrix (ESP32) where routing capacitance and signal degradation prevented the CC1101 from loading at the default 6.5 MHz / 9.0 MHz speeds. Configured both SPI frequencies to 4.0 MHz via menuconfig, which successfully resolved the signal integrity issues and allowed the CC1101 to initialize and function correctly.