Remove SOFTEN_VALUE_0x980, it's been unused since commit
dabe859ec636 ("powerpc: Give hypervisor decrementer interrupts their
own handler") (Sep 2012).
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
 /* This associate vector numbers with bits in paca->irq_happened */
 #define SOFTEN_VALUE_0x500     PACA_IRQ_EE
 #define SOFTEN_VALUE_0x900     PACA_IRQ_DEC
-#define SOFTEN_VALUE_0x980     PACA_IRQ_DEC
 #define SOFTEN_VALUE_0xa00     PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe80     PACA_IRQ_DBELL
 #define SOFTEN_VALUE_0xe60     PACA_IRQ_HMI