MIPS: Kconfig: Make MIPS_MT_SMP a regular Kconfig symbol

Following the removal of SMTC, MIPS_MT_SMP is the only available
MT/SMP option so make it a regular Kconfig symbol.
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/6720/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -1905,19 +1905,8 @@ config CPU_R4K_CACHE_TLB
 	bool
 	default y if !(CPU_R3000 || CPU_R8000 || CPU_SB1 || CPU_TX39XX || CPU_CAVIUM_OCTEON)
 
-choice
-	prompt "MIPS MT options"
-
-config MIPS_MT_DISABLED
-	bool "Disable multithreading support"
-	help
-	  Use this option if your platform does not support the MT ASE
-	  which is hardware multithreading support. On systems without
-	  an MT-enabled processor, this will be the only option that is
-	  available in this menu.
-
 config MIPS_MT_SMP
-	bool "Use 1 TC on each available VPE for SMP"
+	bool "MIPS MT SMP support (1 TC on each available VPE)"
 	depends on SYS_SUPPORTS_MULTITHREADING
 	select CPU_MIPSR2_IRQ_VI
 	select CPU_MIPSR2_IRQ_EI
@@ -1936,8 +1925,6 @@ config MIPS_MT_SMP
 	  Intel Hyperthreading feature. For further information go to
 	  <http://www.imgtec.com/mips/mips-multithreading.asp>.
 
-endchoice
-
 config MIPS_MT
 	bool