Input: rmi4 - use devm_kmalloc for F12 data packet buffer

Input: rmi4 - use devm_kmalloc for F12 data packet buffer

The sensor->data_pkt buffer is used exclusively to store incoming
hardware data during the attention handler, where it is entirely
overwritten by either memcpy() or rmi_read_block(). Therefore,
there is no need to zero-initialize it during probe.

Switch to devm_kmalloc() to avoid the unnecessary memset overhead.

Assisted-by: Gemini:gemini-3.1-pro
Link: https://patch.msgid.link/20260505045952.1570713-16-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>