cpufreq: amd-pstate: fix global sysfs attribute type

In the Linux kernel, the following vulnerability has been resolved:

cpufreq: amd-pstate: fix global sysfs attribute type

In commit 3666062b87ec ("cpufreq: amd-pstate: move to use bus_get_dev_root()")

the "amd_pstate" attributes where moved from a dedicated kobject to the

cpu root kobject.

While the dedicated kobject expects to contain kobj_attributes the root

kobject needs device_attributes.

As the changed arguments are not used by the callbacks it works most of

the time.

However CFI will detect this issue:

[ 4947.849350] CFI failure at dev_attr_show+0x24/0x60 (target: show_status+0x0/0x70; expected type: 0x8651b1de)

...

[ 4947.849409] Call Trace:

[ 4947.849410] <TASK>

[ 4947.849411] ? __warn+0xcf/0x1c0

[ 4947.849414] ? dev_attr_show+0x24/0x60

[ 4947.849415] ? report_cfi_failure+0x4e/0x60

[ 4947.849417] ? handle_cfi_failure+0x14c/0x1d0

[ 4947.849419] ? __cfi_show_status+0x10/0x10

[ 4947.849420] ? handle_bug+0x4f/0x90

[ 4947.849421] ? exc_invalid_op+0x1a/0x60

[ 4947.849422] ? asm_exc_invalid_op+0x1a/0x20

[ 4947.849424] ? __cfi_show_status+0x10/0x10

[ 4947.849425] ? dev_attr_show+0x24/0x60

[ 4947.849426] sysfs_kf_seq_show+0xa6/0x110

[ 4947.849433] seq_read_iter+0x16c/0x4b0

[ 4947.849436] vfs_read+0x272/0x2d0

[ 4947.849438] ksys_read+0x72/0xe0

[ 4947.849439] do_syscall_64+0x76/0xb0

[ 4947.849440] ? do_user_addr_fault+0x252/0x650

[ 4947.849442] ? exc_page_fault+0x7a/0x1b0

[ 4947.849443] entry_SYSCALL_64_after_hwframe+0x72/0xdc