ANDROID: KVM: arm64: use ring_buffer_page_data in hyp_trace_raw_read

In 6.12 kernel version the `struct buffer_data_read_page` changed and
now in order to access the data of the page one should call the newly
added `ring_buffer_read_page_data` function.

Bug: 428904926
Test: presubmit
Test: boot qemu & check reading trace_pipe_raw doesn't cause panic
Change-Id: Ia7d1b5fff35c0ed8f4aeb9ffc5a7c01efaacfac7
Signed-off-by: Nikita Ioffe <ioffe@google.com>