NFC: pn544: i2c: Replace strcpy() with strscpy()

NFC: pn544: i2c: Replace strcpy() with strscpy()

Replace strcpy() with strscpy() which limits the copy to the size of
the destination buffer. Since phy->firmware_name is an array, the
two-argument variant of strscpy() is used - the compiler deduces
the buffer size automatically.

This is a defensive cleanup. As pointed out by Jakub Kicinski
<kuba@kernel.org>, firmware_name is already bounded to
NFC_FIRMWARE_NAME_MAXSIZE via nla_strscpy() in net/nfc/netlink.c
before reaching this driver, so no actual buffer overflow is possible.

Signed-off-by: Tomasz Unger <tomasz.unger@yahoo.pl>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20260301121254.174354-1-tomasz.unger@yahoo.pl
Signed-off-by: Jakub Kicinski <kuba@kernel.org>