net: phy: nxp-c45-tja11xx: rename nxp_c45_tja11xx structure

Rename nxp_c45_tja11xx structure to nxp_c45_tja1103. The driver will
support more PHYs and nxp_c45_tja11xx is too generic.

Signed-off-by: "Radu Pirea (NXP OSS)" <radu-nicolae.pirea@oss.nxp.com>